Polymer film producing method

Details Polymer film producing method Polymer film producing method

2006-07-25

2006-07-25

Lechert, Jr., Stephen J. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

C264S571000, C264S101000, C264S212000, C264S216000, C264S288400, C264S290200, C264S291000

Reexamination Certificate

active

07081224

ABSTRACT:
A solution casting system has a tentering device, and produces polymer film of cellulose triacetate. Two web edge portions of the polymer film are sucked within a section from a downstream end of the tentering device to a first roller that the polymer film contacts first. Furthermore, the two web edge portions are subjected to blowing of gas, or suction, between the first roller and a second roller positioned next downstream from the first roller. Each range of two web edge portions has an effective size in a web width direction less than 25% of that of the polymer film.

REFERENCES:
patent: 3696475 (1972-10-01), Fleissner
patent: 3874043 (1975-04-01), Holm
patent: 6582645 (2003-06-01), Takeda
patent: 6702283 (2004-03-01), Berlingen et al.
patent: 62-115035 (1987-05-01), None
patent: 9-85680 (1997-03-01), None

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